- He is so shy that he cannot even ask people for their contact numbers.
- He is scared of speaking in public. He has nightmares about it. In Braveheart(2013) he opened up, and said that this is the result of his low self esteem.
- Is very close friends with fellow actor/model Kim Woo Bin. They starred in the drama School 2013 as well as many modeling projects together.
- He loves pets, adopted both cats and dogs, and even saved a stray cat in winter.
- He loves watching TV and pretending that he is in that Drama as a character.
- He trained for 3 months to be an idol but in the end left his representing agency because they did not put energy behind an acting career, which was his preference, and which he has successfully pursued since.
- He knows taekwondo and how to play the piano.
- He began his mandatory military service on March 8, 2019, and was discharged on January 2, 2021. He was deemed unfit to enlist as an active duty soldier, serving instead as a public service worker, as a result of going through a car accident when he was 16 and tore his anterior cruciate ligament.
- Through its official Instagram account, "89 Mansion", the Seoul cafe owned by the actor, has announced that its doors will officially close on September 14 2020, Lee Jong Suk's birthday. The cafe is one of many businesses that were left severely affected by the COVID-19 pandemic.
- Having started his career as a model, the multi-talented actor can also sing and dance. He sings two of the original songs in "While You Were Sleeping" TV series and sometimes sings during fan meetings. He also danced Psy's "New Face" during a fan meeting in 2017.
- He is the eldest son. He has a brother who is 2 years younger than him and a sister who is 4 years younger than him.
- He is seen playing a villain (serial killer) for the first time in V.I.P. (2017) movie.
- He was the youngest male model in the Seoul Collection program.
- Korean actor/singer Rain became his role model since watching him in "Full House".
- He was born in Yongin (Gyeonggi-do province), but begun to live on his own in Seoul since high school, after entering a performing arts school.
- In 2017 he was appointed Goodwill Ambassador for Korean tourism. Promotional videos titled "8 episodes of Korea" Featuring the actor were released. They were 8 different genres: documentary, signature, trend, adventure, fantasy, thriller, romance and mystery - to showcase different facets of Korea and included tourist attractions in 10 different regions, including Seoul, Gyeonggi, Gangwon, Jeju and Gyeongju.
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